Osan-Kitsune is a kitsune that has brown fur, a pair of fox ears sit on top of her head, several whisker-like marks on her cheeks and long white hair reaches her waist, noticeably she has a more human-like face than most kitsune. Her eyes have black sclerae with gold pupils and her lips are pink. She wears a white nagajuban under her black kimono that has gold leaves patterned on the lower half and the tamoto, a red obi with a yellow obijime tied over it and a light purple obiage tied around them.
During the battle against Yato-no-Kami in GeGeGe no Kitarō: Nippon Bakuretsu!!, Yobuko calls for help from all over Japan, the remaining 47 Yōkai Warriors are revealed once their mark begins to shine. Among those are Osan-Kitsune, who checks her ear when her mark appears. Afterwards her power is sent to aid Kitarō in defeating Yato-no-Kami.
Due to the fifth anime adaptation's sudden cancellation at 100 episodes, she is among the 23 Yōkai Warriors that were not revealed aside from the movie.